maxis417 said:It has 190 - 200 pounds of compression.
whenfoxforks-ruled said:So, you do not know if its really detonation? Could be a few things. A simple plug check can verify, lean or detonation. Jumping the gun and running race fuel does not help, it may complicate the diagnosis. Is it race fuel from a sealed container? You can run it a little lean on the stand, but I would want no part of my piston splattering off. That knock could even be the wrong sparkplug temperature. Back to the beginning, premium fuel and check the plug. From that check for lean, timing and plug temperature. And see if its detonation, aluminum splatters? Vintage Bob
whenfoxforks-ruled said:Yep. Pinpoint small and real shiny. Well, what does the plug look like? No camera either? Just because you have a tester telling you its pushing 200 psi is no indicator it needs race gas. CC the head, or try premium fuel, and check the plug. There is a lot of things that can cause a sound like a knock in a 2 stroke race engine. Its imperative that you learn to read the plug, or post some really good pics, a lot! Some just sound like that, especially if it has been modded? Vintage Bob
DEANSFASTWAY said:Does the noise go away when you pull inthe clutch if so it could be noise in the tranny and ive heard quite a few of these RMs with loder tranny noise espescially when guys beat the balls out of them in the sand.A bad CDI box will burn the piston down usually with a hole in the dome but id make sure the base timing is right. Good luck
whenfoxforks-ruled said:Reading the plug, or a timing light. So no detonation? Advanced or retarded timing? The plug is wet or dry? Vintage Bob
whenfoxforks-ruled said:If its something still mechanical going on, you are beating your head against a wall. If I had a knock, and no sign of detonation, ovaled bore or the exhaust valve. If the plug appears lean, an air leak, it should have an erratic idle, or erratic throttle response. To test the cdi you need the owners manual and a multi tester. In the mean time: www.dirtrider.net/forums3/showthread.php?t=92818 . If you go to the archives forum, pull down and list all the threads from the beginning. ALL the answers are in there, and no one is hardly ever in there. Vintage Bob[/QUO
Its not mechanical. Its all new. New crank and bearings and seals, new piston and rings and wrist pin and bearing, cylinder was sent off and resleeved. The exhaust valve was also inspected when it was resleeved and clearances checked out good. I did the entire rebuild myself and strongly stand behind my work. I have tested the cdi and most all check within spec. I have seen one or two post that read i little bit high.. Can i have my cdi sent off and re mapped or must it be replaced
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